Cells. Chapter 3 Bio 156 Fall 2006. What is the Cell Theory?. All organisms are made of cells. The cell is the smallest unit of life. New cells come from pre-existing cells. What are microscopes? tools used to view cells.
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Surface of a cell, cilia
DNA: single circular DNA in a nuceloid region
Potato cells with stained leucoplasts (100x).
Surface area-to-volume ratio needs to be greater for an exchange of materials
Microvilli: some cells increase surface area by micro-extensions called microvilli
What are carrier proteins?
Combine with a substance and
help it move across the membrane
What are glycoproteins?For cell to cell identification
What are isotonic solutions?
Same concentration of solutes on either side of the membrane
Put some wilted celery in a glass of cool water. If it has not wilted too much, it will become stiff again. This is because of turgor pressure when the plant cell vacuoles become filled with water, push against the cell walls and become firm.
Building up of larger molecules, takes energy (endergonic)
What is Catabolism?
Breaking down into smaller molecules, gives up energy (exergonic)
sour cream, cheese,
O2 + lactic acid to